Method echo_client

Lib/test/test_socket.py:7326–7331

(self, addr, family)

        event.set()

    def echo_client(self, addr, family):
        with socket.socket(family=family) as sock:
            sock.settimeout(self.timeout)
            sock.connect(addr)
            sock.sendall(b'foo')
            self.assertEqual(sock.recv(1024), b'foo')

    def test_tcp4(self):
        port = socket_helper.find_unused_port()